SSM2167

PRODUCTION

Low Voltage Microphone Preamplifier with Variable Compression & Noise Gating

Data Sheet (Rev. G) Product Selection Table

Part Models: 2
1ku List Price: Starting From $1.41

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Overview

Complete microphone conditioner in a 10-lead package
Single 3 V operation
Low shutdown current < 2 μA
Adjustable noise gate threshold

Adjustable compression ratio
Automatic limiting feature prevents ADC overload
Low noise and distortion: 0.2% THD + N
20 kHz bandwidth

The SSM2167 is a complete and flexible solution for conditioning microphone inputs in personal electronics and computer audio systems. It is also excellent for improving vocal clarity in com-munications and public address systems. A low noise voltage controlled amplifier (VCA) provides a gain that is dynamically adjusted by a control loop to maintain a set compression characteristic. The compression ratio is set by a single resistor and can be varied from 1:1 to over 10:1 relative to the fixed rotation point. Signals above the rotation point are limited to prevent overload and to eliminate popping. A downward expander (noise gate) prevents amplification of background noise or hum. This results in optimized signal levels prior to digitization, thereby eliminating the need for additional gain or attenuation in the digital domain. The flexibility of setting the compression ratio and the time constant of the level detector, coupled with two values of rotation point, make the SSM2167 easy to integrate in a wide variety of microphone conditioning applications.

The device is available in a 10-lead MSOP package, and is guaranteed for operation over the extended industrial temperature range of −40°C to +85°C.

Applications

Desktop, portable, or palmtop computers

Telephone conferencing

Communication headsets

Two-way communications

Surveillance systems

Karaoke and DJ mixers

Part Models: 2
1ku List Price: Starting From $1.41

Documentation

Data Sheet 1

SSM2167: Low Voltage Microphone Preamplifier with Variable Compression and Noise Gating Data Sheet (Rev.G) 07/02/2008

Application Note 3

AN-583: Evaluating the SSM2167 Low Voltage Microphone Preamplifier with Variable Compression and Noise Gating 01/01/2000

AN-938: Digital and Analog Measurement Units for Digital CMOS Microphone Preamplifier ASICs 12/01/2007

AN-1326: Low Noise Analog MEMS Microphone and Preamp with Compression and Noise Gating 06/06/2024

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
SSM2167-1RMZ-R7	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
SSM2167-1RMZ-REEL	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jul 8, 2025 - 24_0103 Qualification of Wafer Fabrication Site at Analog Devices, Inc. Camas for CBCMOS2 Products
		PCN24_0103_Form Material_Report Delta Qualification Matrix Qualification Results Summary
SSM2167-1RMZ-R7	PRODUCTION
SSM2167-1RMZ-REEL	PRODUCTION
May 15, 2012 - 10_0006 Halogen Free Material Change for mini SOIC Products
		PCN10_0006_Form Material_Report Qualification Report Summary Qualification Report Summary
SSM2167-1RMZ-R7	PRODUCTION
SSM2167-1RMZ-REEL	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

SSM2167 Evaluation Board

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Product Details

The AN-583 application note provides a basic explanation of how the board is set up and how to use it to evaluate the SSM2167. This document is only a supplement and makes several references to figures contained in the product data sheet. The current data sheet for the SSM2167 is available on-line.

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